This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 Excerpt: ...is visible at the beginning or end of a transit as a bright spot on a dark background. When the satellite is projected upon some portion of the disk which has the same brightness and color, it becomes invisible. One occasionally appears dark, or even black at some time during transit: this may be because the background ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 Excerpt: ...is visible at the beginning or end of a transit as a bright spot on a dark background. When the satellite is projected upon some portion of the disk which has the same brightness and color, it becomes invisible. One occasionally appears dark, or even black at some time during transit: this may be because the background, on which it is projected at the time, is unusually bright. The shadows of the satellites also make transits: at times, a satellite and its shadow are seen journeying across Jupiter's face in company. 249. Markings and RotationMany observers have reported dark markings on the satellites. Some of the most authoritative recent work is that of Professors Schaeberle and Campbell1 with Fig. 139.--Phenomena Of The Satell1tes. the Lick telescope. Their drawings of the markings on satellite III, made with very high magnifying powers, lend strong support 1 W. W. Campbell, astronomer at the Lick Observatory. to the theory that it continually keeps the same face toward Jupiter. Their observations also show that satellite I is perceptibly elongated, and that its long axis points toward the planet's centre. These satellites therefore resemble the moon in that their times of revolution and rotation are coincident. Schaeberle and others have seen a bright polar cap on satellite III. Barnard discovered a white belt on satellite I, which causes it to appear double when crossing a white part of Jupiter. 250. Pickering's Observations of the Satellites.--In addition to studying the belts, Prof. W. H. Pickering has made careful observations of the satellites. He found the first satellite to be at times very plainly elliptical, the major axis exceeding the minor by ten per cent. For the time of rotation he has deduced a value of 13 h. 3 m., from a series of observ...
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Add this copy of Elements of Descriptive Astronomy: a Text-Book to cart. $70.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2016 by Palala Press.
